Stock Transactions and Unit Redemptions - Gross Unit Redemptions and Share Repurchases of Class A Common Stock (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	1 Months Ended			3 Months Ended								12 Months Ended
	Dec. 31, 2022	Nov. 30, 2022	Oct. 31, 2022	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021
Equity [Abstract]
Redemptions (in shares)				99	214	1,010	43	38	73	4,715	20	1,366	4,846
Repurchases (in shares)	1,804	3,834	307		12,397	8,745	0	26,313	24,433	16,542	965	27,087	68,253
Total redemptions and repurchases (in shares)												28,453	73,099
Redemptions (in dollars per share)				$ 3.88	$ 3.91	$ 3.81	$ 4.01	$ 5.37	$ 5.14	$ 5.82	$ 4.40	$ 3.84	$ 5.80
Repurchases (in dollars per share)	$ 4.48	$ 3.99	$ 3.93		$ 4.03	$ 3.36	$ 0	$ 4.97	$ 5.19	$ 6.25	$ 4.56	3.84	5.35
Total redemptions and repurchases (in dollars per share)												$ 3.84	$ 5.38
Approximate Dollar Value of Units and Shares That Could  Be Redeemed/ Purchased Under the Program at December 31, 2022	$ 376,413			$ 376,413				$ 191,809				$ 376,413	$ 191,809